Hello,

1. The Messenger page does not follow the general site layout rules, as it was specifically designed as an application-style interface that occupies the maximum available space on any device. Other blocks should not be placed on this page, since they interfere with proper functionality. All layout dimensions are calculated dynamically. If this behavior causes layout inconsistencies on your site, we can consider introducing an optional parameter to control its width manually.
2. Regarding the "Go to start" functionality, if I understand correctly, you mean quickly navigating to the beginning of the chat. By default, there is an arrow in the bottom right corner that appears when you scroll up in the conversation. If this is not working as expected, please clarify the issue.